Nitrogen and Phosphorus Removal from Agricultural Runoff in Integrated Buffer Zones

TY - JOUR

T1 - Nitrogen and Phosphorus Removal from Agricultural Runoff in Integrated Buffer Zones

AU - Zak, Dominik

AU - Kronvang, Brian

AU - Carstensen, Mette

AU - Hoffmann, Carl C.

AU - Kjeldgaard, Ane

AU - Larsen, Soren E.

AU - Audet, Joachim

AU - Egemose, Sara

AU - Jorgensen, Charlotte A.

AU - Feuerbach, Peter

AU - Gertz, Flemming

AU - Jensen, Henning S.

PY - 2018/6/5

Y1 - 2018/6/5

N2 - Integrated buffer zones (IBZs) represent a novel form of edge-of-field technology in Northwest Europe. Contrary to the common riparian buffer strips, IBZs collect tile drainage water from agricultural fields by combining a ditch-like pond (POND), where soil particles can settle, and a flow-through filter bed (FILTERBED) planted with Alnus glutinosa (L.), a European alder (black alder). The first experimental IBZ facility was constructed and thoroughly tested in Denmark for its capability to retain various nitrogen (N) and phosphorus (P) species within the first three years after construction. We calculated the water and nutrient budget for the total IBZ and for the two compartments, POND and FILTERBED, separately. Furthermore, a tracer experiment using sodium bromide was conducted in order to trace the water flow and estimate the hydraulic residence time in the FILTERBEDs. The monthly average removal efficiency amounted to 10-67% for total N and 31-69% for total P, with performance being highest during the warm season. Accordingly, we suggest that IBZs may be a valuable modification of dry buffer strips in order to mitigate the adverse impacts of high nutrient loading from agricultural fields on the aquatic environment.

AB - Integrated buffer zones (IBZs) represent a novel form of edge-of-field technology in Northwest Europe. Contrary to the common riparian buffer strips, IBZs collect tile drainage water from agricultural fields by combining a ditch-like pond (POND), where soil particles can settle, and a flow-through filter bed (FILTERBED) planted with Alnus glutinosa (L.), a European alder (black alder). The first experimental IBZ facility was constructed and thoroughly tested in Denmark for its capability to retain various nitrogen (N) and phosphorus (P) species within the first three years after construction. We calculated the water and nutrient budget for the total IBZ and for the two compartments, POND and FILTERBED, separately. Furthermore, a tracer experiment using sodium bromide was conducted in order to trace the water flow and estimate the hydraulic residence time in the FILTERBEDs. The monthly average removal efficiency amounted to 10-67% for total N and 31-69% for total P, with performance being highest during the warm season. Accordingly, we suggest that IBZs may be a valuable modification of dry buffer strips in order to mitigate the adverse impacts of high nutrient loading from agricultural fields on the aquatic environment.

KW - HARMFUL ALGAL BLOOMS

KW - CONSTRUCTED WETLANDS

KW - ORGANIC-CARBON

KW - RIPARIAN ZONES

KW - WATER-QUALITY

KW - FRESH-WATER

KW - NITRATE

KW - RELEASE

KW - DENITRIFICATION

KW - EUTROPHICATION

U2 - 10.1021/acs.est.8b01036

DO - 10.1021/acs.est.8b01036

M3 - Journal article

C2 - 29733209

SN - 0013-936X

VL - 52

SP - 6508

EP - 6517

JO - Environmental Science & Technology

JF - Environmental Science & Technology

IS - 11

ER -